Once a massive star starts to run out of fuel, its core collapses into a dense neutron star. If it is even more massive it may shrink into the densest, most exotic object known - a black hole.
Have you ever imagined the smallest bricks of the Universe - all that atoms with their protons, neutrons, electrons and quarks? With 3D Chemical Elements Screensaver you have the unique opportunity to see how they look like in reality! It brings...